Security readout for executives and security teams
Plain-English summary
CVE-2020-36921 affects RED-V Super Digital Signage System RXV-A740R version 5.1.1. An unauthenticated person on the network can retrieve sensitive webserver and debug log information. This can expose internal details useful for later attacks, even though the reported issue does not directly change data or take systems offline.
Executive priority
Prioritize if RED-V signage systems are internet-facing or connected to sensitive networks. The issue is high severity because no login is required and logs may expose sensitive operational data. If systems are isolated and access-controlled, urgency is lower but remediation should still be tracked.
Technical view
The vulnerability is an information disclosure issue, classified as CWE-548. Public advisories describe unauthenticated access to multiple endpoints exposing system resources and webserver/debug logs. CVSS 3.1 is 7.5: network exploitable, low complexity, no privileges, no user interaction, high confidentiality impact only.
Likely exposure
Exposure is most relevant where RED-V RXV-A740R digital signage systems running version 5.1.1 are reachable from untrusted networks. Internet-facing management interfaces or flat internal networks increase risk. The sources do not identify other affected versions or products.
Exploitation context
Public exploit references exist, including Packet Storm, but the provided sources do not show confirmed active exploitation. The CVE is not listed as KEV in the source bundle. Practical risk comes from unauthenticated log access and potential leakage of operational details.
Researcher notes
Evidence is based on third-party advisories and CVE metadata. The affected product and version are specifically RED-V Super Digital Signage System RXV-A740R 5.1.1. No official patch details are included in the provided sources. Avoid assuming broader RED-V product impact without vendor confirmation.
Mitigation direction
- Identify RED-V RXV-A740R systems and confirm whether version 5.1.1 is present.
- Check RED-V guidance for an official fix or supported upgrade path.
- Remove signage management interfaces from direct internet exposure.
- Restrict access to trusted administrative networks or VPNs only.
- Use firewall rules to block untrusted access to the web interface.
- Review exposed logs for sensitive data and rotate any leaked credentials.
Validation and detection
- Inventory digital signage assets for RED-V RXV-A740R version 5.1.1.
- Confirm whether the device web interface is reachable from untrusted networks.
- Use safe internal validation to ensure logs are not accessible without authentication.
- Review webserver logs for suspicious unauthenticated access to log or debug resources.
- Verify network controls limit access to authorized management hosts only.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-548: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-36921 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- Zero Science Lab Disclosure (ZSL-2020-5609)CVE reference · third-party-advisory
- Packet Storm Security Exploit EntryCVE reference · exploit
- IBM X-Force Vulnerability ExchangeCVE reference · vdb-entry
- CXSecurity Vulnerability DatabaseCVE reference · third-party-advisory
- RED-V Vendor HomepageCVE reference · product
- VulnCheck Advisory: RED-V Super Digital Signage System 5.1.1 Log Information Disclosure VulnerabilityCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Information Through Directory Listing
Exposure of Information Through Directory Listing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.